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Mathematical methods in classical mechanics, classical and quantum field theory, quantum mechanics, statistical mechanics, condensed matter, nuclear and atomic physics.

20 votes

Examples of non-rigorous but efficient mathematical methods in physics

2 votes

How can I conclude that I live in a solar system?

An interesting (and very old) argument in favour of heliocentrism is based on estimates of the relative sizes of the Earth and Sun. Actually, Aristarchus of Samos estimated that the Sun is six to …
Andrey Rekalo's user avatar
4 votes

Can the "physical argument" for the existence of a solution to Dirichlet's problem be made i...

The electrostatic intuition does lead to a correct mathematical formulation of the Dirichlet problem. Let's consider an electric charge distribution of two thin layers (one layer is positive and the …
Andrey Rekalo's user avatar
19 votes
Accepted

Is there a mathematically precise definition of turbulence for solutions of Navier-Stokes?

There is probably no universally accepted mathematical definition of turbulence. (By the way, is there a physical one?) Moreover, the prevailing definitions seem to be highly volatile and time-depend …
Andrey Rekalo's user avatar
4 votes

Ways to prove an inequality

I don't think the question has a meaningful answer unless the OP specifies a class of inequalities he has in mind. The problem is that almost any mathematical statement can be restated as an inequalit …
Andrey Rekalo's user avatar
2 votes

Newton equations, second order equation and (im)possible motions

Newton's second law implies basically that the evolution of a mechanical system is completely determined as soon as the particles' initial positions $x(0)$ and velocities $\dot x(0)$ are specified. S …
Andrey Rekalo's user avatar